CN109541390B - Cable breakage detection method - Google Patents
Cable breakage detection method Download PDFInfo
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- CN109541390B CN109541390B CN201811105924.2A CN201811105924A CN109541390B CN 109541390 B CN109541390 B CN 109541390B CN 201811105924 A CN201811105924 A CN 201811105924A CN 109541390 B CN109541390 B CN 109541390B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
Abstract
The invention discloses a method for detecting cable damage, and belongs to the technical field of ship construction. The method comprises the following steps: s1, confirming the reason of the cable damage, S1.1, judging whether the short circuit occurs between the core wire A and the core wire B, S1.2, judging whether the short circuit occurs between the core wire and the shield; s1.3, judging whether a cable has an end circuit; s2, the position of short circuit between the A core wire and the B core wire is checked, S3, the position of short circuit between the A core wire and the shield is checked, and S4, the position of short circuit between the B core wire and the shield is checked. The portable magnetic field orientation instrument is adopted to detect the cable damage point, the cable binding belt does not need to be removed and the whole cable bundle does not need to be separated, and the cable damage part embedded in the cable cabin penetrating piece can be accurately checked; the method can efficiently search the damaged points in the dense cable bundles, improve the cable repair rate, avoid laying new cables again, save a large amount of manpower and material resources, and has important practical value in certain situations where cable laying cannot be performed again.
Description
Technical Field
The invention belongs to the technical field of ship construction, and particularly relates to a method for detecting cable breakage.
Background
When the ship is built on a slipway, the phenomenon of cable damage frequently occurs due to the complex field construction environment. The cable laying work is often concentrated, the damaged cable is easily covered by the follow-up cable, and the damaged cable cannot be found by observing the appearance. At present, the manual appearance inspection mode is used for searching for a damaged point after a cable is damaged, all cable binding belts on a guide frame need to be detached, and one cable is combed, so that manpower and material resources are extremely consumed. When the cable passes through the cabin penetrating part, the cable cannot be continuously tracked and searched due to the existence of the sealing pouring filler.
Under the condition that the cable damage point cannot be found, a shipyard often lays a new cable again, so that repairable resource waste is caused, excessive redundant cables cause overweight of ships on a guide frame, and congestion is caused in a cable cabin penetrating piece.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for detecting the damage of a cable, which is used for detecting the damage of the cable on a ship.
The purpose of the invention is realized by the following technical scheme:
a method for detecting cable breakage includes the following steps:
s1, confirming the reason of the cable damage,
s1.1, judging whether a short circuit occurs between the core wire A and the core wire B, measuring the internal resistance between the core wire A and the core wire B by using a universal meter, if the internal resistance between the core wire A and the core wire B is not less than 1M omega, indicating that the short circuit does not occur between the core wire A and the core wire B, entering S1.2, and if the internal resistance between the core wire A and the core wire B is less than 1M omega, indicating that the short circuit occurs between the core wire A and the core wire B, entering S2;
s1.2, judging whether a short circuit occurs between the core wire and the shield, respectively measuring internal resistances between the A core wire and the shield and between the B core wire and the shield by using a universal meter, if the internal resistances between the A core wire and the shield and between the B core wire and the shield are not less than 1M omega, indicating that the short circuit does not occur between the A core wire and the shield, entering S1.3, if the internal resistance between the A core wire and the shield is less than 1M omega, indicating that the short circuit occurs between the A core wire and the shield, entering S3, and if the internal resistance between the B core wire and the shield is less than 1M omega, indicating that the short circuit occurs between the B core wire and the shield, entering S4;
s1.3, connecting one end of an A core wire into a ship body, measuring whether the other end of the A core wire is conducted with the ship body or not by using a universal meter, if the reading of the universal meter is larger than 1M omega, indicating that the A core wire is cut off and the circuit is opened, needing to replace a cable, connecting one end of a B core wire into the ship body, measuring whether the other end of the B core wire is conducted with the ship body or not by using the universal meter, and if the reading of the universal meter is larger than 1M omega, indicating that the B core wire is cut off;
s2, checking the position of short circuit between the A core wire and the B core wire,
s2.1, confirming a path passed by the detected cable;
s2.2, connecting the positive pole of the direct current power supply to the A core wire of the detected cable at the head end of the detected cable;
s2.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point and the first detection point, placing a magnetic field direction finder at the first detection point, connecting the negative pole of a direct current power supply to the B core wire at the head end of the detected cable, observing whether the pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, and if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative pole of the direct current power supply from the B core wire at the head end of the detected cable;
s2.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing a magnetic field direction finder at the second detection point, connecting the negative pole of the direct current power supply to the B core wire at the head end of the detected cable, observing whether the pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that the short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative pole of the direct current power supply from the B core wire at the head end of the detected cable;
s2.5, repeating S2.4, continuously reducing the length of the short-circuit section, connecting the negative electrode of the direct-current power supply to the B core wire at the head end of the detected cable when the length of the short-circuit section is less than 2 m, detecting the whole short-circuit section by using a magnetic field direction finder, and determining a short-circuit point between the A core wire and the B core wire;
s3, checking the position of short circuit between the A core wire and the shield,
s3.1, confirming a path passed by the detected cable;
s3.2, confirming the position of the short circuit between the core wire A and the shield, and connecting the positive pole of the direct current power supply to the core wire A of the detected cable at the head end of the detected cable;
s3.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point and the first detection point, placing a magnetic field direction finder at the first detection point, connecting the negative pole of a direct current power supply to a shield on one side of the head end of the detected cable, observing whether a pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, and if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative pole of the direct current power supply from the shield;
s3.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing a magnetic field direction finder at the second detection point, connecting the negative pole of the direct-current power supply to the shield on one side of the head end of the detected cable, observing whether the pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that the short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative pole of the direct-current power supply from the shield;
s3.5, repeating S3.4, continuously reducing the length of the short-circuit section, connecting the negative electrode of the direct-current power supply to the shield on one side of the head end of the detected cable when the length of the short-circuit section is less than 2 meters, detecting the whole short-circuit section by using a magnetic field direction finder, and confirming a short-circuit point between the core wire A and the shield;
s4, checking the position of short circuit between the B core wire and the shield,
s4.1, confirming a path passed by the detected cable;
s4.2, confirming the position of short circuit between the B core wire and the shield, and connecting the positive pole of the direct current power supply to the B core wire of the detected cable at the head end of the detected cable;
s4.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point and the first detection point, placing a magnetic field direction finder at the first detection point, connecting the negative pole of a direct current power supply to a shield on one side of the head end of the detected cable, observing whether a pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, and if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative pole of the direct current power supply from the shield;
s4.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing a magnetic field direction finder at the second detection point, connecting the negative pole of the direct-current power supply to the shield on one side of the head end of the detected cable, observing whether the pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that the short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative pole of the direct-current power supply from the shield;
s4.5, repeating S4.4, continuously reducing the length of the short-circuit section, connecting the negative electrode of the direct-current power supply to the shield on one side of the head end of the detected cable when the length of the short-circuit section is less than 2 m, detecting the whole short-circuit section by using a magnetic field direction finder, and determining a short-circuit point between the B core wire and the shield;
preferably, in S2.4, after the short-circuit point between the a core wire and the B core wire is identified, the binding tape at the short-circuit point between the a core wire and the B core wire on the guide frame is detached, and each cable at the short-circuit point between the a core wire and the B core wire on the guide frame is inspected, thereby identifying the cable that has been damaged.
Preferably, in S3.5, after the short-circuit point between the a core wire and the shield is identified, the binder tape at the short-circuit point between the a core wire and the shield on the guide frame is detached, and each cable at the short-circuit point between the a core wire and the shield on the guide frame is inspected, thereby identifying the cable that has been damaged.
Preferably, in S4.5, after the short-circuit point between the B-core wire and the shield is identified, the binder tape at the short-circuit point between the B-core wire and the shield on the guide frame is detached, and each cable at the short-circuit point between the B-core wire and the shield on the guide frame is inspected, thereby identifying the cable that has been damaged.
Preferably, in S2, S3 and S4, the distance between the magnetic field direction finder and the detected cable is not more than 5 cm.
Preferably, in S2, when the negative electrode of the dc power supply is connected to the B-core wire of the detection cable, the connection time between the negative electrode of the dc power supply and the B-core wire of the detection cable is not more than 5 seconds.
Preferably, in S3 and S4, when the negative electrode of the dc power supply is connected to the shield, the connection time between the negative electrode of the dc power supply and the shield is not more than 5 seconds.
Preferably, in S2, S3 and S4, the voltage of the dc power supply is 48 volts.
Preferably, when the negative electrode of the dc power supply is connected to the B-core wire or the shield, the connection is performed by a lap joint method.
The invention has the beneficial effects that: the direct current power supply is used for generating direct current on the damaged cable for the detection of the magnetic field direction finder, and the direct current has the characteristics of strong induced magnetic field and stable magnetic field; the magnetic field direction finder is an instrument capable of detecting weak magnetic fields. The dry battery is used as a power supply, is portable and is suitable for field mobile detection of the magnetic field; the method adopts the portable magnetic field direction finder to detect the damaged point of the cable, does not need to remove the cable binding belt and separate the whole cable, and can accurately detect the damaged part of the cable embedded in the cable cabin penetrating piece; the method can efficiently search the damaged points in the dense cable bundles, improve the cable repair rate, avoid laying new cables again and save a large amount of manpower and material resources. The method has important practical value in certain situations where cable laying cannot be performed again.
Drawings
FIG. 1 is a schematic diagram illustrating a method for detecting a short circuit between an A core wire and a B core wire of a cable by using a DC power supply according to the method for detecting a cable breakage of the present invention.
In fig. 1: 1 is an A core wire, 2 is a B core wire, 3 is a direct current power supply, 4 is an anode, 5 is a magnetic field direction finder, and 6 is a cathode.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments:
the following detailed description of the method for detecting cable breakage according to the present invention is provided in conjunction with the accompanying drawings and specific embodiments, so as to clearly and clearly express the structural features and specific applications of the present invention, but the scope of the present invention should not be limited thereby.
Example (b): as shown in fig. 1, a method for detecting a cable breakage includes the following steps:
s1, confirming the reason of the cable damage,
s1.1, judging whether a short circuit occurs between the core wire A1 and the core wire B2, measuring the internal resistance between the core wire A1 and the core wire B2 by using a universal meter, if the internal resistance between the core wire A1 and the core wire B2 is not less than 1M omega, indicating that the short circuit does not occur between the core wire A1 and the core wire B2, entering S1.2, and if the internal resistance between the core wire A1 and the core wire B2 is less than 1M omega, indicating that the short circuit occurs between the core wire A1 and the core wire B2, entering S2;
s1.2, judging whether a short circuit occurs between the core wire and the shield, respectively measuring internal resistances between the A core wire and the shield and between the B core wire and the shield by using a universal meter, if the internal resistances between the A core wire and the shield and between the B core wire and the shield are not less than 1M omega, indicating that the short circuit does not occur between the A core wire and the shield, entering S1.3, if the internal resistance between the A core wire and the shield is less than 1M omega, indicating that the short circuit occurs between the A core wire and the shield, entering S3, and if the internal resistance between the B core wire and the shield is less than 1M omega, indicating that the short circuit occurs between the B core wire and the shield, entering S4;
s1.3, connecting one end of an A core wire into a ship body, measuring whether the other end of the A core wire is conducted with the ship body or not by using a universal meter, if the reading of the universal meter is larger than 1M omega, indicating that the A core wire is cut off and the circuit is opened, needing to replace a cable, connecting one end of a B core wire into the ship body, measuring whether the other end of the B core wire is conducted with the ship body or not by using the universal meter, and if the reading of the universal meter is larger than 1M omega, indicating that the B core wire is cut off;
s2, checking the position of short circuit between the A core wire and the B core wire,
s2.1, confirming a path passed by the detected cable;
s2.2, connecting the anode 4 of the direct current power supply 3 to the core wire A1 of the detected cable at the head end of the detected cable;
s2.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point, placing a magnetic field direction finder 5 at the first detection point, connecting a negative electrode 6 of a direct current power supply 3 to the B core wire 2 at the head end of the detected cable, observing whether a pointer of the magnetic field direction finder 5 rotates, if the pointer of the magnetic field direction finder 5 does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, and if the pointer of the magnetic field direction finder 5 rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative electrode 6 of the direct current power supply 3 from the B core wire 2 at the head end of the detected cable;
s2.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing the magnetic field direction finder 5 at the second detection point, connecting the negative electrode 6 of the direct current power supply 3 to the B core wire 2 at the head end of the detected cable, observing whether the pointer of the magnetic field direction finder 5 rotates, if the pointer of the magnetic field direction finder 5 does not rotate, indicating that the short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder 5 rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative electrode 6 of the direct current power supply 3 from the B core wire 2 at the head end of the detected cable;
s2.5, repeating S2.4, continuously reducing the length of the short-circuit section, connecting a negative electrode 6 of a direct-current power supply 3 to the B core wire 2 at the head end of the detected cable when the length of the short-circuit section is less than 2 meters, detecting the whole short-circuit section by using a magnetic field direction finder 5, and confirming a short-circuit point between the A core wire 1 and the B core wire 2;
s3, checking the position of short circuit between the A core wire and the shield,
s3.1, confirming a path passed by the detected cable;
s3.2, confirming the position of the short circuit between the core wire A and the shield, and connecting the positive pole of the direct current power supply to the core wire A of the detected cable at the head end of the detected cable;
s3.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point and the first detection point, placing a magnetic field direction finder at the first detection point, connecting the negative pole of a direct current power supply to a shield on one side of the head end of the detected cable, observing whether a pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, and if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative pole of the direct current power supply from the shield;
s3.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing a magnetic field direction finder at the second detection point, connecting the negative pole of the direct-current power supply to the shield on one side of the head end of the detected cable, observing whether the pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that the short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative pole of the direct-current power supply from the shield;
s3.5, repeating S3.4, continuously reducing the length of the short-circuit section, connecting the negative electrode of the direct-current power supply to the shield on one side of the head end of the detected cable when the length of the short-circuit section is less than 2 meters, detecting the whole short-circuit section by using a magnetic field direction finder, and confirming a short-circuit point between the core wire A and the shield;
s4, checking the position of short circuit between the B core wire and the shield,
s4.1, confirming a path passed by the detected cable;
s4.2, confirming the position of short circuit between the B core wire and the shield, and connecting the positive pole of the direct current power supply to the B core wire of the detected cable at the head end of the detected cable;
s4.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point and the first detection point, placing a magnetic field direction finder at the first detection point, connecting the negative pole of a direct current power supply to a shield on one side of the head end of the detected cable, observing whether a pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, and if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative pole of the direct current power supply from the shield;
s4.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing a magnetic field direction finder at the second detection point, connecting the negative pole of the direct-current power supply to the shield on one side of the head end of the detected cable, observing whether the pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that the short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative pole of the direct-current power supply from the shield;
s4.5, repeating S4.4, continuously reducing the length of the short-circuit section, connecting the negative electrode of the direct-current power supply to the shield on one side of the head end of the detected cable when the length of the short-circuit section is less than 2 m, detecting the whole short-circuit section by using a magnetic field direction finder, and determining a short-circuit point between the B core wire and the shield;
preferably, in S2.4, after the short-circuit point between the a core wire and the B core wire is confirmed, the binding tape at the short-circuit point between the a core wire and the B core wire on the guide frame is detached, and each cable at the short-circuit point between the a core wire and the B core wire on the guide frame is inspected, thereby confirming the occurrence of the damaged cable.
Further preferably, in S3.5, after the short-circuit point between the a-core and the shield is identified, the binding tape at the short-circuit point between the a-core and the shield on the guide frame is detached, and each cable at the short-circuit point between the a-core and the shield on the guide frame is inspected, thereby confirming the occurrence of the damaged cable.
As a further preferable mode, in S4.5, after the short-circuit point between the B-core wire and the shield is identified, the binding tape at the short-circuit point between the B-core wire and the shield on the guide frame is detached, and each cable at the short-circuit point between the B-core wire and the shield on the guide frame is inspected, thereby confirming that the cable is broken.
As a further preference, in S2, S3 and S4, the distance between the magnetic field direction finder and the detected cable is not more than 5 cm.
More preferably, in S2, when the negative electrode of the dc power supply is connected to the B-core wire of the detection cable, the connection time between the negative electrode of the dc power supply and the B-core wire of the detection cable is not more than 5 seconds.
More preferably, in S3 and S4, when the negative electrode of the dc power supply is connected to the shield, the connection time between the negative electrode of the dc power supply and the shield is not more than 5 seconds.
As a further preferred example, in S2, S3 and S4, the voltage of the dc power supply is 48 volts.
More preferably, the negative electrode of the dc power supply is connected to the B-core wire or the shield by overlapping.
The method adopts the portable magnetic field direction finder to detect the damaged point of the cable, does not need to remove the cable binding belt and separate the whole cable, and can accurately detect the damaged part of the cable embedded in the cable cabin penetrating piece; the method can efficiently search the damaged points in the dense cable bundles, improve the cable repair rate, avoid laying new cables again and save a large amount of manpower and material resources. The method has important practical value in certain situations where cable laying cannot be performed again.
The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.
Claims (8)
1. A method of detecting cable breakage, the method comprising the steps of:
s1, confirming the reason of the cable damage,
s1.1, judging whether a short circuit occurs between the core wire A (1) and the core wire B (2), measuring the internal resistance between the core wire A and the core wire B by using a universal meter, if the internal resistance between the core wire A and the core wire B is not less than 1M omega, indicating that the short circuit does not occur between the core wire A and the core wire B, entering S1.2, and if the internal resistance between the core wire A and the core wire B is less than 1M omega, indicating that the short circuit occurs between the core wire A and the core wire B, entering S2;
s1.2, judging whether a short circuit occurs between the core wire and the shield, respectively measuring internal resistances between the A core wire and the shield and between the B core wire and the shield by using a universal meter, if the internal resistances between the A core wire and the shield and between the B core wire and the shield are not less than 1M omega, indicating that the short circuit does not occur between the A core wire and the shield, entering S1.3, if the internal resistance between the A core wire and the shield is less than 1M omega, indicating that the short circuit occurs between the A core wire and the shield, entering S3, and if the internal resistance between the B core wire and the shield is less than 1M omega, indicating that the short circuit occurs between the B core wire and the shield, entering S4;
s1.3, connecting one end of an A core wire into a ship body, measuring whether the other end of the A core wire is conducted with the ship body or not by using a universal meter, if the reading of the universal meter is larger than 1M omega, indicating that the A core wire is cut off and the circuit is opened, needing to replace a cable, connecting one end of a B core wire into the ship body, measuring whether the other end of the B core wire is conducted with the ship body or not by using the universal meter, and if the reading of the universal meter is larger than 1M omega, indicating that the B core wire is cut off;
s2, checking the position of short circuit between the A core wire (1) and the B core wire (2),
s2.1, confirming a path passed by the detected cable;
s2.2, connecting the positive pole (4) of the direct current power supply (3) to the core wire A (1) of the detected cable at the head end of the detected cable;
s2.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point, placing a magnetic field direction finder (5) at the first detection point, connecting the negative pole (6) of a direct current power supply (3) to the B core wire (2) at the head end of the detected cable, observing whether a pointer of the magnetic field direction finder (5) rotates, if the pointer of the magnetic field direction finder (5) does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, if the pointer of the magnetic field direction finder (5) rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative pole (6) of the direct current power supply (3) from the B core wire (2) at the head end of the detected cable;
s2.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing a magnetic field direction finder (5) at the second detection point, connecting a negative pole (6) of a direct current power supply (3) to the B core wire (2) at the head end of the detected cable, observing whether a pointer of the magnetic field direction finder (5) rotates, if the pointer of the magnetic field direction finder (5) does not rotate, indicating that a short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder (5) rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative pole of the direct current power supply (3) from the B core wire (2) at the head end of the detected cable;
s2.5, repeating S2.4, continuously reducing the length of the short-circuit section, connecting the negative electrode of the direct-current power supply to the B core wire at the head end of the detected cable when the length of the short-circuit section is less than 2 m, detecting the whole short-circuit section by using a magnetic field direction finder, and determining a short-circuit point between the A core wire and the B core wire;
s3, checking the position of short circuit between the A core wire and the shield,
s3.1, confirming a path passed by the detected cable;
s3.2, confirming the position of the short circuit between the core wire A and the shield, and connecting the positive pole of the direct current power supply to the core wire A of the detected cable at the head end of the detected cable;
s3.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point and the first detection point, placing a magnetic field direction finder at the first detection point, connecting the negative pole of a direct current power supply to a shield on one side of the head end of the detected cable, observing whether a pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, and if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative pole of the direct current power supply from the shield;
s3.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing a magnetic field direction finder at the second detection point, connecting the negative pole of the direct-current power supply to the shield on one side of the head end of the detected cable, observing whether the pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that the short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative pole of the direct-current power supply from the shield;
s3.5, repeating S3.4, continuously reducing the length of the short-circuit section, connecting the negative electrode of the direct-current power supply to the shield on one side of the head end of the detected cable when the length of the short-circuit section is less than 2 meters, detecting the whole short-circuit section by using a magnetic field direction finder, and confirming a short-circuit point between the core wire A and the shield;
s4, checking the position of short circuit between the B core wire and the shield,
s4.1, confirming a path passed by the detected cable;
s4.2, confirming the position of short circuit between the B core wire and the shield, and connecting the positive pole of the direct current power supply to the B core wire of the detected cable at the head end of the detected cable;
s4.3, dividing the detected cable into two first detection sections by taking the middle point of the detected cable as a first detection point and the first detection point, placing a magnetic field direction finder at the first detection point, connecting the negative pole of a direct current power supply to a shield on one side of the head end of the detected cable, observing whether a pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that a short-circuit point is positioned on the first detection section before the first detection point, and if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the first detection section after the first detection point, marking the first detection section where the short-circuit point is positioned as a short-circuit section, and disconnecting the negative pole of the direct current power supply from the shield;
s4.4, taking the middle point of the short-circuit section as a second detection point, dividing the short-circuit section into two second detection sections by the second detection point, placing a magnetic field direction finder at the second detection point, connecting the negative pole of the direct-current power supply to the shield on one side of the head end of the detected cable, observing whether the pointer of the magnetic field direction finder rotates, if the pointer of the magnetic field direction finder does not rotate, indicating that the short-circuit point is positioned on the second detection section before the second detection point, if the pointer of the magnetic field direction finder rotates, indicating that the short-circuit point is positioned on the second detection section after the second detection point, marking the second detection section where the short-circuit point is positioned as the short-circuit section, and disconnecting the negative pole of the direct-current power supply from the shield;
and S4.5, repeating S4.4, continuously reducing the length of the short-circuit section, connecting the negative electrode of the direct-current power supply to the shield on one side of the head end of the detected cable when the length of the short-circuit section is less than 2 m, detecting the whole short-circuit section by using a magnetic field direction finder, and determining a short-circuit point between the B core wire and the shield.
2. The method as claimed in claim 1, wherein in S2.4, after the short-circuit point between the a core wire and the B core wire is identified, the binding tape at the short-circuit point between the a core wire and the B core wire on the guide frame is detached, and each cable at the short-circuit point between the a core wire and the B core wire on the guide frame is inspected, thereby identifying the broken cable.
3. The method as claimed in claim 1, wherein in S3.5, after the short circuit point between the a core and the shield is identified, the binder tape at the short circuit point between the a core and the shield on the guide frame is detached, and each cable at the short circuit point between the a core and the shield on the guide frame is inspected, thereby identifying the cable which has broken.
4. The method as claimed in claim 1, wherein in S4.5, after the short circuit point between the B-core and the shield is identified, the binder tape at the short circuit point between the B-core and the shield on the guide frame is detached, and each cable at the short circuit point between the B-core and the shield on the guide frame is inspected, thereby identifying the cable which has broken.
5. The method as claimed in claim 1, wherein in S2, S3 and S4, the distance between the magnetic field direction finder and the cable to be detected is not more than 5 cm.
6. The method according to claim 1, wherein in step S2, when the negative electrode of the DC power supply is connected to the B-core wire of the cable to be detected, the connection time between the negative electrode of the DC power supply and the B-core wire of the cable to be detected is not more than 5 seconds.
7. The method as claimed in claim 1, wherein in the step S3 and S4, when the negative pole of the DC power supply is connected to the shield, the connection time between the negative pole of the DC power supply and the shield is not more than 5 seconds.
8. The method of claim 1, wherein the cable breakage detection is performed by a cable breakage detection device,
in S2, S3, and S4, the voltage of the dc power supply is 48 volts.
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